login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188561 Number of nX3 binary arrays without the pattern 1 1 1 diagonally, vertically or horizontally 1
7, 49, 247, 1383, 7722, 42712, 237116, 1315783, 7300042, 40505756, 224748056, 1247024929, 6919195733, 38391539384, 213017628693, 1181940415631, 6558063227535, 36387785244039, 201899687047572, 1120251845376251 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A188567

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=a(n-1)+11*a(n-2)+60*a(n-3)+89*a(n-4)+107*a(n-5)-75*a(n-6)-50*a(n-7)-157*a(n-8)+184*a(n-9)-91*a(n-10)+86*a(n-11)-35*a(n-12)+13*a(n-13)-14*a(n-14)+4*a(n-15)

EXAMPLE

Some solutions for 4X3

..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..1..1....1..0..0

..0..1..0....0..1..0....0..1..1....1..1..0....1..1..0....1..1..0....0..1..1

..1..1..0....1..0..1....1..0..1....0..0..1....0..1..1....0..0..1....1..1..0

..0..0..1....0..0..1....0..0..0....1..1..0....1..0..0....0..0..1....1..0..1

CROSSREFS

Sequence in context: A207089 A224150 A094430 * A225013 A228459 A203059

Adjacent sequences:  A188558 A188559 A188560 * A188562 A188563 A188564

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 04 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 7 20:18 EST 2019. Contains 329847 sequences. (Running on oeis4.)